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Signals in dBµ were observed on the meter of a Tecsun PL880 receiver tuned to a local FM station on 90.3 MHz (18″ whip receive antenna length, vertically polarized, height about 6 feet above the earth). Three locations along a radial line from the transmit antenna were used: in front of, inside, and behind my home. My home is of brick veneer construction, single-story ranch.
Front yard: 56 dBµ, varying about +/-3 dB across a ten foot perpendicular bisector of the radial
Centered inside the home: 56 dBµ, same variation as above
Back yard: 56 dBµ, same variation as above.
A legal Part 15 FM station would not produce fields as great as the above, but the variation produced by changes in the receive antenna location would be the same.
So the “building penetration” loss at VHF, per se, is not a serious issue as concerns these types of structures.